My in-laws always tell me about the infamous flea infestation they had. They had one or two dogs, and apparently some fleas got inside. Then the in-laws locked up the house with the doors and windows closed for a weekend camping, they took the dogs of course. They came back and literally their carpet was crawling with black. It's not good when you can see the fleas without having to bend over and look! So, in a short weekend, the fleas had filled the house.
I personally can't stand fleas either, so I feel your pain!